heap mojo: migrate background fetch

Use HeapMojoReceiver wrapper so that Oilpan will GC the object.

Change-Id: Ie86954d7a9e5e705cf33eda703d2427bb060f777
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100457Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Mugdha Lakhani <nator@chromium.org>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#759941}

third_party/blink/renderer/modules/background_fetch/background_fetch_registration.cc

@@ -36,7 +36,9 @@ BackgroundFetchRegistration::BackgroundFetchRegistration(
       download_total_(registration->registration_data->download_total),
       downloaded_(registration->registration_data->downloaded),
       result_(registration->registration_data->result),
-      failure_reason_(registration->registration_data->failure_reason) {
+      failure_reason_(registration->registration_data->failure_reason),
+      observer_receiver_(this,
+                         service_worker_registration->GetExecutionContext()) {
   DCHECK(service_worker_registration);
   registration_ = service_worker_registration;
   registration_service_.Bind(std::move(registration->registration_interface));
@@ -377,6 +379,7 @@ void BackgroundFetchRegistration::UpdateUI(
 void BackgroundFetchRegistration::Trace(Visitor* visitor) {
   visitor->Trace(registration_);
   visitor->Trace(observers_);
+  visitor->Trace(observer_receiver_);
   EventTargetWithInlineData::Trace(visitor);
   ActiveScriptWrappable::Trace(visitor);
 }

third_party/blink/renderer/modules/background_fetch/background_fetch_registration.h

@@ -5,7 +5,6 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_BACKGROUND_FETCH_BACKGROUND_FETCH_REGISTRATION_H_
 #define THIRD_PARTY_BLINK_RENDERER_MODULES_BACKGROUND_FETCH_BACKGROUND_FETCH_REGISTRATION_H_
 
-#include "mojo/public/cpp/bindings/receiver.h"
 #include "mojo/public/cpp/bindings/remote.h"
 #include "third_party/blink/public/mojom/background_fetch/background_fetch.mojom-blink.h"
 #include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h"
@@ -14,6 +13,8 @@
 #include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
 #include "third_party/blink/renderer/platform/heap/garbage_collected.h"
 #include "third_party/blink/renderer/platform/heap/handle.h"
+#include "third_party/blink/renderer/platform/mojo/heap_mojo_receiver.h"
+#include "third_party/blink/renderer/platform/mojo/heap_mojo_wrapper_mode.h"
 #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
 
 namespace blink {
@@ -139,8 +140,10 @@ class BackgroundFetchRegistration final
   mojo::Remote<mojom::blink::BackgroundFetchRegistrationService>
       registration_service_;
 
-  mojo::Receiver<blink::mojom::blink::BackgroundFetchRegistrationObserver>
-      observer_receiver_{this};
+  HeapMojoReceiver<blink::mojom::blink::BackgroundFetchRegistrationObserver,
+                   BackgroundFetchRegistration,
+                   HeapMojoWrapperMode::kWithoutContextObserver>
+      observer_receiver_;
 };
 
 }  // namespace blink